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Orthodontic Therapy > Crossbites > Flashcards

Crossbites Flashcards

1
Q

Name the three local factors for Crossbites

A
  1. Dental Crowding
  2. Habits
  3. Cleft Lip and Palate
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2
Q

Most common Dental crowding for Anterior Crossbites

A

Lateral Incisors

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3
Q

An early loss of deciduous second molars can cause crowding…

A

Of the permanent premolars

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4
Q

What impact does habits have on the dental arch to cause crossbites

A
  1. Narrow Upper arch
  2. Posterior crossbites
  3. Pressure applied to anterior maxilla= proclined
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5
Q

What trt would be planned for a Thumbsucker for Crossbites

A
  1. Digit dissuader ( removable)
  2. 7/8 years old - as centrals, laterals and perm molars need to be present.
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6
Q

How does a Quadhelix correct for a crossbite?

A

1.Expands Upper arch
2. Can be used as a dissuader for habits
3. Active - expands and is adjusted
4. Passive - Retention of expanded arch

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7
Q

What is used for Anterior Crossbites?

A

1.Anterior expansion screws and Z springs
Creates labial movement
2. 3D Expansion screw ( expands and creates Labial movements)

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8
Q

What is used for Posterior Crossbites?

A
  1. Midline Screw
    2.Coffin Spring
  2. 3D Expansion Screw ( Expands)
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9
Q

What does a bite posterior bite plane do for Crossbites?

A
  1. Props open bite
  2. Stops occlusal Interference
  3. Allows teeth to move
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10
Q

Name two Functional Appliances used for Crossbites

A
  1. Frankel Appliance
  2. Clarks TB
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11
Q

How does a Frankel Appliance correct Crossbites?

A
  • Buccal Shields reduce the soft tissues
  • Allows expansion of arch passively
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12
Q

How does a Clark TB Appliance correct Crossbites?

A
  • Midline screw corrects ant/post arch relationship by Expansion
  • Corrects transverse relationship
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13
Q

How do Fixed Appliances correct Crossbites?

A
  • Torquing with rectangle wires - uprights teeth out of crossbite
    *Posterior blocks to correct ant crossbites
  • Elastics - Upper = palatal to Lower = Buccal
  • TMA Wires - buccal crossbites - expand arch
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14
Q

How can a Lingual Crossbite be corrected?

A
  • Elastics Lower= lingual to Upper = Buccal
  • SS/ TMA Wires - expand lower arch
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15
Q

How does Headgear correct Crossbites?

A
  • The facebow creates expansion of the Upper arch
  • Applied to the Intermolar Region
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16
Q

What is RME?

A

Rapid Maxillary Expansion

17
Q

What happens with RME?

A
  • Midline Palatal Suture Splits
  • Skeletal Expansion
    *Expands and corrects crossbites
18
Q

What is the screw called on a RME and how is it used by the patient?

A
  • Hyrax screw
  • activated 4 x a day
  • 1mm movement a day
19
Q

What Retention is needed for RME?

A

*RME left passively for 3 months
* prevents relapse and allows bony infill

20
Q

what is important in stabilising and preventing crossbite relapse?

A
  • Overbite - 1/3 coverage
    *good intercuspation
21
Q

Define “Crossbite”

A

Abnormal relationship between arches
*Buco - palatal
*Buco - Lingual

22
Q

Define a Posterior Crossbite

A

BBB
Buccal cusp of the Lower
occludes
Buccally to the upper buccal
cusp
w
m

23
Q

Define a Lingual Crossbite

A

BPP
Buccal cusp of the lower cusp
occludes
Paltally to the palaal cusp of the upper teeth
w
m

24
Q

Unilateral Crossbite

A

One side

25
Q

Bilateral Crossbite

A

Both sides

26
Q

Skeletal III Crossbites..

A
  • mandible = protrusive
    = Buccal Crossbites
    = Anterior Crossbites
27
Q

Skeletal II Crossbites ..

A
  • Mandible is retroclined
    = lingual crossbites
    Thumbsucking = Posterior crossbites
28
Q

Narrow Maxilla Crossbites…

A
  • Unilateral and bilateral crossbites
  • can be caused by a digit sucker
    = buccal crossbites
29
Q

Mandibular displacements can cause….

A

Unilateral crossbites due to displacement

30
Q

How do the soft tissues effect Crossbites?

A

*Soft tissues can create a narrow Maxilla EG, Thumbsucker, Mouthbreather - changes the positon of the tongue
* Effect the balance between the cheeks and the tongue

31
Q

What is a Displacement?

A

When the mandible slides and occludes into a more comfortable position due to interference.

Orthodontic Therapy (29 decks)

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